Too Many Fed LEO's in Oconomowoc

So this happened.

An Oconomowoc man who identified himself as a federal agent is accused of being a serial rapist and assaulting three women over a span of four years, according to court documents. 

David S. Scharlat, 53, was charged Friday with five counts of felony sexual assault, ranging from first to third degree, in Waukesha County Circuit Court. If convicted, he faces decades behind bars. ...

So.  Is he Feeb?  US Marshal?  ATF/E? Border Patrol? DEA?  Secret Service?

Nope. 

...Scharlat is an agent with the U.S. Department of State Diplomatic Security Services. On Friday, a spokesperson for the State Department could not comment on his employment status or the investigation....

Yah, well, next time we have a Saudi Arabian prince in Oconomowoc, the prince will have to fend for himself, I guess.  

How many of these Federal badge-toters are "diplomatic security" and what the Hell was one doing in Oconomowoc, WI?